QuantFinance

Modern pricing and risk stacks often behave as if everything changed on every tick: graphs are rebuilt, objects are rebound, and broad caches invalidated. In reality, most portfolios and market states change only marginally between ticks (and especially between days). This talk presents a practical architecture that exploits that property: snapshot barriers to guarantee “as-of” coherence, delta sets to represent change explicitly, and layered precomputations enabling a fast path for steady-state positions and a slow path for new/amended trades. We’ll show how deterministic compiled valuation plans remove runtime traversal overhead, and how minimal run/snapshot lineage makes results replayable and debuggable.

This is a follow-up to Why Large Quantitative Analytics Platforms Rarely Fail All at Once. That post argued platforms slowly lose coherence; this one is about one structural choice that helps keep it. Thesis: When dependencies are knowable (as they often are in pricing and risk), explicit orchestration plus explicit caching scales better than runtime discovery plus database-as-memoisation (i.e., when the persistence layer quietly becomes the cache and dependency catalogue). This is not an argument against graphs. It is an argument about where you pay complexity. ...

Why do large quantitative analytics platforms fail? The unsatisfying but honest answer is: it depends. There is rarely a single root cause. Platforms almost never collapse because of one flawed model, one architectural mistake, or a single ill-judged rewrite. Most platforms do not break suddenly. They slowly lose coherence. They continue to run, produce numbers, and deliver outputs, yet over time the relationship between assumptions, inputs, and results becomes increasingly difficult to explain. Understanding this distinction matters. There is a difference between a system that stops working and a system that no longer makes sense. ...